Five lens objective



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United States Patent 3,099,702 FIVE LENS OBJECTIVE Johannes Berger, Heidenheim (Brenz), Wurttemberg,

Germany, assignor to Carl Zeiss, Heidenheim (Brenz),

Wurttemherg, Germany Filed Feb. 12, 1962, Ser. No. 172,829 Claims priority, application Germany Oct. 30, 1958 1 Claim. (Cl. 88-57) This application is a continuation-in-part application of my copending application Ser. No. 848,867, filed October 26, 1959, now abandoned.

The invention concerns objectives for taking photographs as well as for projection, particularly for smallfilm projectors. It is the aim of the invention to produce objectives for the said purpose which with a relatively large aperture ratio of 1:1.2 cover an angular field of 28 with good definition. Object of the invention is an objective which consists of five lenses the first being a meniscus-shaped collective lens with its concave surface turned towards the second lens, the said second lens being an asymmetrical collective lens turning its surface of smaller curvature towards the third lens, the said third lens being an asymmetrical dispersive lens turning its surface of stronger curvature towards the fourth lens which is also an asymmetrical dispersive lens turning its surface of stronger curvature towards the fifth lens while the fifth lens is a biconvex collective lens and in which objective additionally the following conditions are simultaneously satisfied:

(a) The sum of the air spaces between the individual lenses is smaller than 30% but greater than of the overall length wherein the overalllength itself is greater than 80% of the focal length;

The appended table contains the design data for one.

embodiment of an objective according to the invention. The table values are normalized for a focal length of j=l.0.

In the FIGURE and in the table there are designated:

By L, the lenses,

By r, the radii,

By d, the axial separations,

By n the refractive indices for the d-line of the spectrum, By p the corresponding A'bb numbers, and

' By s, the focal intercept.

3,099,702 Patented July 30, 1963 Table Lenses Radll Axial sepam m rations rt =+0.84527 Lr d1=0 .21437 1, 71300 53 89 dz=0.00394 T: =+0.62932 Lu ds=0 .22669 1, 71300 53 .89

d4=0,00000 rs 19. 3384 Lnr v ds=0.04928 1.69895 30.05

dc=0.05322 r7 14.2948 Lrv d =0.16ll5 1.80518 25.46

da=0.l6263 re =+0.53342 Lv da=0.18234 1.74400 44.90

NOTE.S' =0.3l59.

I claim:

A photographic objective consisting of five lenses of which the first is a meniscus-shaped collective lens with its concave surface turned towards the second lens, the said second lens being an asymmetrical collective lens tuming its surface of smaller curvature towards the third lens, the said third lens being an asymmetrical dispersive lens turning its surface of stronger curvature towards the fourth lens, the said fourth lens being also an asymmetrical dispersive lens turning its surface of stronger curvature towards the fifth lens, and the said fifth lens being a biconvex collective lens, characterized by the combination of the following features: I

(a) the sum of the air spaces between the individual lenses is smaller than 30% but greater than 10% of the overall length wherein the overall length itself is greater than of the focal length;

and furthermore characterized in that its design data lie so close to the values to be taken from the appended table that none of the axial separations (d) differs by more than 3 4 the values given in paa-antheses below the respective sepa wherein are designated ration value given in the following table: by L, the lenses,

by r, the radii, Lenses Radll m 113 w 1311/) by d, the axial separations,

5 by n the refractive rndrces for the d-line of the specr1 =+0 34521-1 +0 .8435l7/f 1----- F? $6 35! 53-89 by v the correspondrng Abb numbers, and

. 1 by s, the focal intercept. n =+4.m1-1 -0.144680/j zf j 10 No references cited.

(-0.000 n =+0 .02032-1 +1 .132969/1 LlI---- d;=0.22869-f 1.71300 53.89

-0.03) n =-19.33s4't +0 .036870/1 d4=0.00000 (+0.03) (-0- r5 =-19.33s4-r -0.03e143/1 Lm--- d;=0.0492s- 1.69895 30.05

(+0 .03) -0.02 v r4=+1.1519-l 0.606780// 3 d6=0.o5322-f 1 (+0.03) (-0.01 r =-14.294s-1 -0.056327/f LIV--- d1=0 .l6115'f 1.80518 25.40

a da=0.16263-j (+0.03) -0.03 n =+0.53342-1 +1.394773/f Lv..-- dn=0.18234-f 1.74400 44.90

0.03 m=-0.s7000r +0.855113/f 

